| Parameter |
Value |
| Designation |
349P/Lemmon |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-08-26T12:49:38.985600Z |
| Orbit solution date (soln_date, UTC) |
2024-06-14T15:42:23Z |
| Obs used |
209 |
| NEO |
- |
| M1 |
10.800 |
| K1 |
17.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-08-10.0000000 |
| e |
0.29990139 |
| q (au) |
2.499745 |
| a (au) |
3.570561 |
| i (deg) |
5.492271 |
| Ω (om, deg) |
331.761163 |
| ω (w, deg) |
255.998978 |
| M (ma, deg) |
104.225129 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.374 + 3.702\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.374 |
| n |
3.702 |
| gf |
0.994 |
| gb |
-0.646 |
| k |
0.914 |
| δ90 |
9.992 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
00:49:07.06 |
+08:01:08.3 |
HIP 3862 |
7.87 |
| 2026-06-01 12:00 |
00:49:29.28 |
+08:03:56.3 |
HIP 3862 |
6.79 |
| 2026-06-02 00:00 |
00:49:51.40 |
+08:06:43.5 |
HIP 3862 |
10.30 |
| 2026-06-02 12:00 |
00:50:13.40 |
+08:09:30.2 |
HIP 3963 |
12.42 |
| 2026-06-03 00:00 |
00:50:35.30 |
+08:12:16.2 |
HIP 3968 |
10.15 |
| 2026-06-03 12:00 |
00:50:57.08 |
+08:15:01.5 |
HIP 3968 |
5.25 |
| 2026-06-04 00:00 |
00:51:18.75 |
+08:17:46.2 |
HIP 3968 |
5.00 |
| 2026-06-04 12:00 |
00:51:40.31 |
+08:20:30.3 |
HIP 3968 |
9.72 |
| 2026-06-05 00:00 |
00:52:01.75 |
+08:23:13.7 |
HIP 3968 |
15.33 |
| 2026-06-05 12:00 |
00:52:23.08 |
+08:25:56.4 |
HIP 4094 |
14.19 |
| 2026-06-06 00:00 |
00:52:44.30 |
+08:28:38.4 |
HIP 4094 |
11.64 |
| 2026-06-06 12:00 |
00:53:05.40 |
+08:31:19.8 |
HIP 4094 |
11.77 |
| 2026-06-07 00:00 |
00:53:26.38 |
+08:34:00.5 |
HIP 4094 |
14.49 |
| 2026-06-07 12:00 |
00:53:47.24 |
+08:36:40.5 |
HIP 4094 |
18.67 |
| 2026-06-08 00:00 |
00:54:07.99 |
+08:39:19.8 |
HIP 4094 |
23.52 |
| 2026-06-08 12:00 |
00:54:28.61 |
+08:41:58.4 |
HIP 4094 |
28.68 |
| 2026-06-09 00:00 |
00:54:49.11 |
+08:44:36.3 |
HIP 4094 |
34.00 |
| 2026-06-09 12:00 |
00:55:09.50 |
+08:47:13.5 |
HIP 4399 |
33.53 |
| 2026-06-10 00:00 |
00:55:29.75 |
+08:49:50.0 |
HIP 4413 |
28.55 |
| 2026-06-10 12:00 |
00:55:49.89 |
+08:52:25.8 |
HIP 4413 |
23.82 |
| 2026-06-11 00:00 |
00:56:09.90 |
+08:55:00.9 |
HIP 4413 |
19.57 |
| 2026-06-11 12:00 |
00:56:29.78 |
+08:57:35.3 |
HIP 4413 |
16.18 |
| 2026-06-12 00:00 |
00:56:49.54 |
+09:00:08.9 |
HIP 4413 |
14.21 |
| 2026-06-12 12:00 |
00:57:09.16 |
+09:02:41.7 |
HIP 4413 |
14.22 |
| 2026-06-13 00:00 |
00:57:28.66 |
+09:05:13.9 |
HIP 4413 |
16.18 |
| 2026-06-13 12:00 |
00:57:48.03 |
+09:07:45.3 |
HIP 4413 |
19.49 |
| 2026-06-14 00:00 |
00:58:07.27 |
+09:10:15.9 |
HIP 4485 |
22.97 |
| 2026-06-14 12:00 |
00:58:26.37 |
+09:12:45.8 |
HIP 4485 |
23.26 |
| 2026-06-15 00:00 |
00:58:45.34 |
+09:15:14.9 |
HIP 4485 |
24.71 |
| 2026-06-15 12:00 |
00:59:04.18 |
+09:17:43.2 |
HIP 4728 |
26.67 |
| 2026-06-16 00:00 |
00:59:22.88 |
+09:20:10.8 |
HIP 4728 |
21.44 |
| 2026-06-16 12:00 |
00:59:41.44 |
+09:22:37.6 |
HIP 4728 |
16.26 |
| 2026-06-17 00:00 |
00:59:59.87 |
+09:25:03.6 |
HIP 4728 |
11.13 |
| 2026-06-17 12:00 |
01:00:18.16 |
+09:27:28.8 |
HIP 4728 |
6.07 |
| 2026-06-18 00:00 |
01:00:36.31 |
+09:29:53.3 |
HIP 4728 |
1.50 |
| 2026-06-18 12:00 |
01:00:54.32 |
+09:32:16.9 |
HIP 4728 |
4.36 |
| 2026-06-19 00:00 |
01:01:12.18 |
+09:34:39.7 |
HIP 4728 |
9.28 |
| 2026-06-19 12:00 |
01:01:29.91 |
+09:37:01.7 |
HIP 4806 |
8.36 |
| 2026-06-20 00:00 |
01:01:47.49 |
+09:39:23.0 |
HIP 4806 |
5.49 |
| 2026-06-20 12:00 |
01:02:04.93 |
+09:41:43.4 |
HIP 4806 |
6.22 |
| 2026-06-21 00:00 |
01:02:22.23 |
+09:44:03.0 |
HIP 4806 |
9.72 |
| 2026-06-21 12:00 |
01:02:39.37 |
+09:46:21.7 |
HIP 4806 |
14.01 |
| 2026-06-22 00:00 |
01:02:56.38 |
+09:48:39.7 |
HIP 4806 |
18.52 |